if any modem does not have a SIM card inserted and engine is started, the engine will try to initalise the modem, VCOM shows “Connected”

when the initialisation fails, VCOM shows “Disconnected”

refer video clip below, Modem ID 2 (COM port no. 17) has a SIM card inserted with blue LED blinking, but others do not have any SIM cards, only Modem ID 2 stays “Connected”, others will show “Connected” then “Disconnected”